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Гавричев, К. С.; Sharpataya, G. A.; Gorbunov, V. E.; Golushina, L. N.; Plakhotnik, V. N.; Goncharova, I. V.; Gurevich, V. M.

doi:10.1023/a:1022102914631

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Despite the fact that the data on the thermal stability of LiPF 6 are somewhat contradictory [11][12][13][14][15], both literature data and our experimental evidence indicate that, at room temperature, the decomposition of LiPF 6 , producing gaseous phosphorus pentafluoride and solid lithium fluoride according to Eq. (1), is negligible.…”

Section: Introductionmentioning

confidence: 59%

Hydrolysis in the system LiPF6—propylene carbonate—dimethyl carbonate—H2O

Plakhotnyk

Ernst

Schmutzler

2005

Journal of Fluorine Chemistry

319

326

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Section: Introductionmentioning

confidence: 59%

Hydrolysis in the system LiPF6—propylene carbonate—dimethyl carbonate—H2O

Plakhotnyk

Ernst

Schmutzler

2005

Journal of Fluorine Chemistry

319

326

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“…Calorimetric studies of alkali metal tetrafluoroborates have been reported. 20 KBF 4 and NaBF 4 are known to undergo reversible solid−solid phase transformations before their melting points. KBF 4 undergoes an orthorhombic (Pnma) to disordered cubic phase (Fm3̅ m) transition at 285 °C, with ΔH = 120 J/g (15.1 kJ/mol).…”

Section: Introductionmentioning

confidence: 99%

Revisiting Solid–Solid Phase Transitions in Sodium and Potassium Tetrafluoroborate for Thermal Energy Storage

Konar,

Zieniute,

Lascelles

et al. 2024

Chem. Mater.

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In situ synchrotron powder X-ray diffraction (PXRD) study was conducted on sodium and potassium tetrafluoroborate (NaBF 4 and KBF 4 ) to elucidate structural changes across solid−solid phase transitions over multiple heating−cooling cycles. The phase transition temperatures from diffraction measurements are consistent with the differential scanning calorimetry data (∼240 °C for NaBF 4 and ∼290 °C for KBF 4 ). The crystal structure of the high-temperature (HT) NaBF 4 phase was determined from synchrotron PXRD data. The HT disordered phase of NaBF 4 crystallizes in the hexagonal, space group P6 3 /mmc (no. 194) with a = 4.98936(2) Å, c = 7.73464(4) Å, V = 166.748(2) Å 3 , and Z = 2 at 250 °C. Density functional theory molecular dynamics (MD) calculations imply that the P6 3 / mmc is indeed a stable structure for rotational NaBF 4 . MD simulations reproduce the experimental phase sequence upon heating and indicate that F atoms are markedly more mobile than K and B atoms in the disordered state. Thermal expansion coefficients for both phases were determined from high-precision lattice parameters at elevated temperatures, as obtained from Rietveld refinement of the PXRD data. Interestingly, for the HT-phase of NaBF 4 , the structure (upon heating) contracts slightly in the a−b plane but expands in the c direction such that overall thermal expansion is positive. Thermal conductivities at room temperature were measured, and the values are 0.8−1.0 W m −1 K −1 for NaBF 4 and 0.55−0.65 W m −1 K −1 for KBF 4 . The thermal conductivity and diffusivity showed a gradual decrease up to the transition temperature and then rose slightly. Both materials show good thermal and structural stabilities over multiple heating/cooling cycles.

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“…Hexafluoroarsenate usually originates from waste water in the glass industry 8 (production of crystal glass). The salts containing hexafluoroarsenate anion are also used as herbicides 9 and as electrolytes in lithium batteries 10 . For example, KAsF6 is used as a pesticide 11 under various brand names (Hexaflurate, Nopalmate, TD-840).…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenic from aqueous solution containing hexafluoroarsenate

Parschová

Mištová

2021

Ion Exch. Lett.

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Arsenic removal from aqueous solutions containing hexafluoroarsenate or arsenate by strong and weak base anion exchangers was studied by dynamic column tests that were carried out using solution containing arsenic and accompanying anions (chlorides, sulfates and fluorides). The specific flow rate of solution was 6 BV/h. Desorption of arsenic was carried out by 1 mol/L NaOH or 2 mol/L KSCN. All the studied anion exchangers performed well in the absence of accompanying anions. In the presence of chlorides and sulfates, studied exchangers showed high selectivity towards hexafluoroarsenate.

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Cited by 6 publications

References 4 publications

Hydrolysis in the system LiPF6—propylene carbonate—dimethyl carbonate—H2O

Hydrolysis in the system LiPF6—propylene carbonate—dimethyl carbonate—H2O

Revisiting Solid–Solid Phase Transitions in Sodium and Potassium Tetrafluoroborate for Thermal Energy Storage

Removal of arsenic from aqueous solution containing hexafluoroarsenate

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